It was used to establish new world records in aviation for sustained flight (heavier-than-air), refueled flight, sustained flight (lighter-than-air), and distance.
en.wikipedia.org However, the lighter-than-air sewer gas collects in the ceiling, while propane collects on the floor.
en.wikipedia.org Unlike kites (which rely solely on the wind for power) and balloons (which require specialty lighter-than-air gases), helicopters are normally powered by aviation fuels.
en.wikipedia.org In all, the flight broke existing world records for sustained flight (heavier-than-air), refueled flight, sustained flight (lighter-than-air), and distance.
en.wikipedia.org The social commentary wipes clean with a dry towelette - it's not intrusive and not pedantic, just lighter-than-air.
en.wikipedia.org